Add Coveralls token and module execution test to GitHub Actions workf…

…low.

.github/workflows/lint-test-cover-docs.yml

@@ -20,13 +20,15 @@ jobs:
           pip install -U .[lint,test]
           python -m pylint fountains # Check against linting rules.
           python -m pytest # Run tests.
+          python src/fountains/fountains.py -v # Run tests via execution.
       - name: Publish coverage results.
         run: |
           pip install -U .[coveralls]
           python -m coveralls --service=github # Submit to coveralls.
-        if: matrix.python-version == '3.8'
+        if: matrix.python-version == '3.11'
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
       - name: Test auto-generation of documentation.
         run: |
           pip install -U .[docs]